16 Cyg surrounded by galaxy group (lowenthalm)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: 16 c Cyg · PGC 2371699 · PGC 63529 · PGC 63532 · PGC 63534 · TYC3564-2971-1 · TYC3565-1524-1 · TYC3565-1525-1 · TYC3565-299-1 · TYC3565-321-1 · TYC3565-445-1 · TYC3565-859-1 · TYC3565-89-1 · TYC3565-925-1 · TYC3569-104-1 · TYC3569-247-1 · TYC3569-318-1 · TYC3569-348-1 · TYC3569-376-1 · TYC3569-569-1 · The star 16Cyg

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16 Cyg surrounded by galaxy group

Acquisition type: Lucky imaging

Powered byPixInsight

16 Cyg surrounded by galaxy group

Acquisition type: Lucky imaging

I was poking around at double stars and came across this pair of stars, 16 Cygni A and B floating in front of a distant galaxy cluster. This is a true double star in that the stars do in fACT orbit each other. The pair is 69 light years away from us, so with a current separation of about 42 arc seconds, this makes the the projected separation between the stars of around 880 AU. This is of course a minimum gap as the exact orbital orientation to us is unknown so they may in fact be quite a bit farther apart than this. The orbit estimate from about 20 years ago estimates A and B orbit each other in anywhere from 18,200 to 1.3 million years. We will have to watched it for a long time to get a more accurate idea of the orbit. They are nearly identical to one another and being spectral type G they are both very similar to our own sun (1.2x diameter, 1.08x mass, 1.5x brightness).

As an added bonus this star system has two hidden members: 16 Cygni A is orbited closely (within 73AU) by a red dwarf star. 16 Cygni B is orbited by a planet of about 2.38 Jupiter masses at a distance roughly 1.693AU(semi-major axis) in a highly elliptical orbit that it completes in 799.5 days. The planet was discovered using the radial velocity technique.

The galaxy cluster far in the background is roughly 350 million light years away from us.

This field was the Kepler mission observing field, and so contains five other verified planets and planet candidates that were discovered during the course of the Kepler mission. I have marked this in the annotated version of the image.

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B

Description: Annotated version marking stars with exoplanets

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Status	Advanced success
Started	...
Astrometry.net job	4879389
PixInsight job	FIPCO1TI67KPX88QPS8K8EK6FNTXHD7M
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	19h41m49s.632
RA (top/left)	19h41m07s.510
RA (top/right)	19h40m56s.553
RA (bottom/right)	19h42m31s.857
RA (bottom/left)	19h42m43s.490

Dec (center)	+50°34′37″.30
Dec (top/left)	+50°46′36″.69
Dec (top/right)	+50°23′44″.50
Dec (bottom/right)	+50°22′35″.56
Dec (bottom/left)	+50°45′27″.84

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16 Cyg surrounded by galaxy group

16 Cyg surrounded by galaxy group

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16 Cyg surrounded by galaxy group

16 Cyg surrounded by galaxy group

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